Friction-clutch



(No Model.)

J. W. V. RAW'LINS. FRIGTION CLUTCH.

'N0.-377,777.- PatentedPeb.14,1888.

2o wheel or drum, to which end the invention UNITED STATES `ATFNT OFFICE...

JOSEPH w. v. nAwLINs, OF HANCOCK, MICHIGAN.

FRICTION- CLUTCH.

SPECIFICATION forming part o'f Letters Patent No. 377,777, dated February 14,1888.

y Application filed June 6, 1887. Serial No. 240,391. (No model.)

To @ZZ whom it may concern.-

Be it known that I, JOSEPH W. V. RAW- LINs, of Hancock, in the county of Houghton, State of Michigan, have invented certain new and useful Improvements in Friction-Clutches, of which the following is hereby declared to be a full, clear, and exact description, suficient to enable others skilled in the art to which said invention appertains to make and use the same.

My invention relates to clutches of that class wherein a constantly-revolving wheel is engaged or disengaged at will by'means of fric-v tion-clutch, with acompanion wheelor drumd loosely set upon its shaft, and partaking of the movement of the driving-wheel through the medium of the clutch mechanism.

The invention has forits obj ect to furnish a steady even connection between. the driving Wheel or pulley and the loosely-set companion consists in certain improvements in the struct ure of the clutch mechanism, connecting the driving pulley or drum -at will with the power wheeler pulley, the nature of which'wll appear from the following description, and be thereafter distinctly pointed out in the claims at the conclusion thereof. In the accompanying drawings, forming par of this specification, Figure l is a view in elevation, on line .fr @c of Fig. 2, of my improved friction clutch applied to a hoisting drum. Fig. 2 is a view in longitudinal central section of the hoisting-drum with the friction-clutch applied thereto. Fig. 3 is a detail view,lpartly in section and partly in elevation, of a modified form of the toggle mechanism forming part of the friction-clutch; Fig. 4 is a sectional view thereof on line ky wQIEigB. Fig. 5 isa detail section of the d'rum 'flange and segment. i Keyed or otherwise firmly lsecured to the shaft A is the gear-wheel B, which in the form v A- shown is furnished about its outer rim with the usual circumferential gear-teeth, b. Instead of being a gear-driver, the wheel B may be of the usual pulley form suited to a driving band or cable; or the shaft A may be driven by crank o r pulley or other vconvenient means separately from the wheel B, in which event said wheel B will be employed merely as one part of the friction-clutch mechanism, now to be described.

The drum or pulley C is set loosely upon the lshaft A and runs freely thereon without partaking of the movement of such shaft, except during the intervals when it is locked thereto by means of the clutch device. Next to the driver-wheel B the drum or pulley is furnished J terpart, the collar may be secured to the hub by spline and key or like expedient, permittingthe collarto slide freely along the hub at the same time that the hub and drum partake of the rotary movement of the collar.y v

Pivoted, as at l, to the collar d are the toggle-arms e, which at their outer ends vpivotallyy carry, as at 2, the toggle-blocksf. AThe toggleblocks f are snugly fitted to pass Within recesses or slots cast or cut at-intervals about the circumferential fiange y, projecting from the drum or wheel C. Around the outer face of the flange g are arranged the segments h, constituting one part of the clutch proper. These segments preferably break joint, as shown-that is, the adjacent segments are secured near their ends in common to the same toggle-block, f. The holes in the segments, through which the bolts pass to secure the segments to the common toggle-block, are made somewhat largerthan the bolts, in manner to permit a slight lateral play or adj ustbinding. The outer or bearing face of Vthe series of segmentsf h is turned to a true circuit, so as to furnish a smooth bearing for the clutch.

Within an annular recess of the driver Bis set the series of blocks i, constituting the lag-'- ging. The annular recess in the driver Bis preferably dovetail in section, to better retain thelagging in place, and said lagging, together with the segments 71., which contact therewith,

-are preferably made of wood, or the lagging of wood and t-he segments of iron, to afford a stout clutch or grip capable of replacement when the parts are worn by use. The projecting faces of the lagging t are turned to a true perimeter concentric with that of the segments h. Rods 7c, secured at one end to the toggle-collar d, extend through the drum C, and are fastened at their opposite ends to the loose shipping collar Z. The rods k are preferably sustained, as at 3 4, in the heads M n of the drum C. Upon operating the shipperlever 0, (dotted lines, Fig. 2..) the collar Z and rods 7c shift the toggle-collar d along its bearing upon the hub c, thus causing the togglelevers e to force outward the toggle-blocks f and segments 7L, so that the latter bear at their friction-face against the lagging fi. By this means the drum or wheel O is firmly clutched or locked with the driver B, and in consequence partakes of the rotary movement of said driver. rlhe slots or recesses in the rim g aiord a snug guide and bearing for the segments h and toggle-blocks f, so that these parts can stoutl y withstand the strain when the clutch engagement is made. By reversing the shipper-lever o the segments 7L are withdrawn from contact with the lagging t and the drum or pulley C thereupon released from revolution with the shaft A.

Instead of having the togglearms e pivotally secured to the toggle-collar d and toggleblocks f, respectively, as already described, the toggle-arms may have screw-terminals of reverse thread, as at e', Fig. 3, which terminals engage with correspondingly-threaded seats in the toggle-collar d and the toggle-blocks g. In such event the shifting-rods k, extending through the drum C from the shipper-collar l, will be pivoted, as at p, to a lug or ear upon each of the toggle-arms e. Upon imparting an endwise shift to the rods 7c the toggle-arms e will be rotated partially about, throwing the toggle-blocks g', and in consequence the segments h', bolted thereto, toward or away from the lagging Vhichever form of toggle-arm connection between the toggle-collar and toggle-block be employed, it is plain that the steady support of the toggle-blocks and segments by the recessed rim g of the drum C is insured. The slight endwise play of the segments h, as the same are secured to the toggleblocks f, permits the outward thrust of the segments to occur without hinderance or binding, these segments, through the limited play at their fastenings, readjusting themselves to the enlargement in perimeter as the outward thrust occurs. By reason of the firm bearing which is afforded both to the toggle-collar and to the toggle-blocks, in accordance with my invention, the action of the clutch becomes rigid and exact without lost motion or undue strain upon the parts, the driving-shaft A is not weakened by cutting the slots therein,

while the relation of the rods k to the shippercollar Z and the toggle mechanism allows the clutch to bey retained or controlled positively in both directions of the shift.

In accordance with the invention it will be seen that the toggle mechanism is carried byy about the entire circuit'of the drum, contactv ing with the inner rim of the driver around the perimeter thereof, so that the toggle-arms act reciprocally to sustain each other and to withstand the shock through the'common collar, which rests upon the driven hub.

Obviously the details of the structure may be varied within the skill of the mechanic without departing from the spirit of the invention, which is manifestly not limited to the precise elements in manner and form as here tofore set forth. y

Although the invention has been shown and described in connection with a winding-drum, it is applicable in like manner to a driven wheel or pulley, and it is accordingly to be understood that the use of the term drum in the claims following is merely in way of description and not of limitation, said claims including the equivalents of such drum in combination the same as if they had been specified therein.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with the supportingshaft and with the driver-wheel having a friction-flange thereon, of the driven drum and its projecting hub, the toggle-collar set upon said proj ectinghub, the toggle-arms secured to said collar, and the toggle-blocks carried by said arms and having friction-faces to engage with the ange of the driver-wheel, substantially as described.

2. The combination, with the supportingshaft, of the drum and its projecting hub mounted thereon, the collarset upon said hub, the toggle-arms secured to said collar, and the toggle-blocks carried by said arms, substantially as described.

3. The combination, with the supportingshaft and with the drum mounted thereon, and having a projecting hub and recessed rim, of the collar set upon said hub, the toggle-arms secured to said collar, and the toggle-blocks carried by said arms and extending through the recesses in the flange of said drum, substantially as described.

4. The combination, with the supportingshaft and with the driver-wheel having an inner friction-fiange, of the driven drum having a projecting hub and recessed rim, the togglecollar set upon said hub, the toggle-arms se- IOO IIS

cured to said collar, and the toggle-blocks carried by said arms and eXtending through the recesses in the rim of said drum, substantially as described. p

5. In friction clutches, the combination, with the circumferential supporting-blocks, of the friction-segmentssecured thereto, and having limited endwise shift to compensate for the thrust of thevsupporting-blocks, substantially as described.

6. 'In frictionclutches, the combination, with the toggle-collar and the series of arms extending therefrom,I of 'the supporting-blocks sustained thereby and the friction-'segments bolted to said blocks Withlimited shift therein,l substantially as described.

7. The combination, with 'the drum having the projecting'hub and recessed rim, of the toggle-collar set upon saidy hub, the togglearms secured to said collar, the supportingzo blocks carried by said arms, and the frictionsegments extending through the recesses of said rim and secured to said blocks, substantially as described.

, 8. The combination, with the supporting- 25 shaft and with the drum mounted thereon and having a projecting hub, of -theshipper-,col1ar, the connecting-rods, the togg1ecol1ar set upon said hub, the toggle-arms secured to said'collar, and the friction-blocks. carried by said 3o arms, substantially as described.

JOSEPH W. V. vRALINS. 

